2018 Audi S5 Sportback Starts At $55,375 byTips and Tricks •15:04 The standard popular features of the Audi S5 3.0T Premium Plus include 3.0L V-6 354hp intercooled turbo engine, 8-speed Tiptronic automatic transmission with overdrive, 4-wheel anti-lock brakes (ABS), side seat mounted airbags, …